Raul, I have been studying this very subject for about 3 months now. An Excellent book that helped me is by Larry Pesavento
Fibonacci Ratios with Pattern Recognition. It is 49.00 and worth much more. If you want to discuss this further you can PM me with your phone number and I will call you. I am looking for people to talk to about this because it helps me learn also.

The fact that you noticed that the indexes could not penetrate the .382 retracement is telling you that the down trend is strong so far.